How to Edit and Convert CSV Files Online — Free Browser Tool
Why Edit CSV in the Browser?
CSV (Comma-Separated Values) is the universal data format — every database, spreadsheet, and analytics tool can read it. But opening large CSVs in Excel is slow, and Google Sheets has a 10MB limit. FreeCSVKit's editor handles files up to 100MB directly in your browser, with instant loading, sorting, filtering, and editing.
Opening and Editing CSV Files
Drag and drop your CSV file into the editor. The tool auto-detects delimiters (comma, semicolon, tab, pipe) and character encoding (UTF-8, Latin-1, etc.). Edit cells inline by clicking, add or remove rows and columns, sort by any column (ascending/descending), and filter rows by value. Changes are reflected in real-time.
Converting CSV to Other Formats
The CSV Converter transforms your data between formats: CSV to JSON (for APIs and web apps), CSV to XML (for enterprise systems), JSON to CSV (for spreadsheet analysis), and CSV to SQL INSERT statements (for database imports). Each conversion preserves data types and handles edge cases like commas in quoted fields.
Analyzing Your Data
The CSV Analyzer gives you instant insights: row/column counts, data types per column, null/empty value counts, unique value counts, min/max/average for numeric columns, and most frequent values. This is perfect for quick data quality checks before importing into a database or analytics tool.
Working with Large Files
FreeCSVKit is optimized for large files. It uses streaming parsing (not loading the entire file into memory at once), virtual scrolling (only rendering visible rows), and web workers for heavy operations. A 50MB CSV with 500,000 rows opens in seconds and scrolls smoothly.